最新刊期
      卷 ， 期 4 ， 2000
      • ZHANG Xu
        Issue 4, Pages: 1-5(2000) DOI: 10.13756/j.gtxyj.2000.04.001
        摘要：The paper begins with a brief mention of various stages of communication development in the world. Then it explains in detail how the Internet stimulates the explosive growth of data communication traffic, and raises the idea of the new data centric packet based national network in the new millennium. It also describes how the application of optical fiber technology promotes the formation of large capacity broadband network and how the application of wireless mobile system promotes the realization of the global personal communication. Finally, a few remarks are made for the communication development trends in the new millennium.  
        关键词：communication network;data communication;optical fiber communication;mobile communication   
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      • QIN Xiao yi,ZENG Lie guang,HUANG Fu wei
        Issue 4, Pages: 6-11(2000) DOI: 10.13756/j.gtxyj.2000.04.002
        摘要：ATM PON is important to the development of broadband access networks due to the advantages such as low cost, great performances, flexible access and so on. In this paper, the frame designs of ATM PON TC layer chips and some techniques of the integrated designs have been presented in detail. The TC layer chips include the OLT TC layer chip and the ONU TC layer chip. The paper has also presented the key techniques which can drop the work speed and power of the integrated circuits, such as the parallel scrambling, the parallel HEC generating and checking, the parallel cell delimiting and the distributed sample descrambling.  
        关键词：ATM-PON;TC layer;integrated design;parallel techniques   
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      • WANG Yong,YIN Hong xi,WU De ming,XU An shi
        Issue 4, Pages: 12-15(2000) DOI: 10.13756/j.gtxyj.2000.04.003
        摘要：This paper introduces a new access networks concept: wavelength division multiplexing passive optical networks. We emphasize the superiority of its architecture and analyze two special technologies adopted by recent WDMPON architecture: optical source sharing and spectral slicing. In the end, we indicate that WDMPON is the best candidate for future broadband network. It will offer important reference for telecommunication carriers to consider the best choice for the future OAN.  
        关键词：OAN;WDMPON;optical source sharing;spectral slicing   
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      • FENG Jian he,QIAO Yao jun,CHEN Shu qiang,GUAN Ke jian
        Issue 4, Pages: 16-21(2000) DOI: 10.13756/j.gtxyj.2000.04.004
        摘要：The performance of all optical wavelength convertion based on cross gain modulation in semiconductor optical amplifier is analyzed. According to the relationships explored between the signal powers, probe powers, the gain of SOA and the signal to noise ratios and extinction ratios of the converted signal, we proposed the methods for optimum design of AOWC.  
        关键词：wavelength division multiplexing;wavelength conversion;cross gain modulation;semiconductor optical amplifier;ER;SNR   
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      • SHENG Li,TANG Wei zhong,ZHOU Wen
        Issue 4, Pages: 22-26(2000) DOI: 10.13756/j.gtxyj.2000.04.005
        摘要：According to the characteristic of free space optical communication, and on the basis of theoretical analysis and numerical emulation, we bring forward a design of long wavelength optical transmitter applied to inter satellite optical communication. We analyze the influency of the amplified spontaneous emission on the gain of SNR under the high power signal and pump condition and calculate the optimized caliber of the optical antenna with the OOK modulation on the basis of the requirement to the BER of the inter satellite optical communication system.  
        关键词：inter satellite optical communication;optical transmitter;EDFA;optical antenna   
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      • WANG Jun fang,LIU Hai,LIU De ming,HUANG De xiu
        Issue 4, Pages: 27-30(2000) DOI: 10.13756/j.gtxyj.2000.04.006
        摘要：The significance of the virtual experiment in remote education and the test items in SDH system are introduced in this paper.Taking the average emitting optical power measurement for example, this paper describes in details the implementation process of the SDH system virtual experiment in remote education.  
        关键词：SDH system;virtual experiment;remote education;modeling;ActiveX   
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      • HUANG Xuan ze 1,HUANG De xiu 2
        Issue 4, Pages: 31-33(2000) DOI: 10.13756/j.gtxyj.2000.04.007
        摘要：The characteristics of C band EDFA, including output power, signal gain, noise figure are studied in this paper. Based on the requirements of DWDM system, we have designed the gain flattenned EDFA used in 32 channels DWDM systems. After 5×25 dB transmission, the flatness of the output signal is below 3.5 dB, OSNR>27 dB, the dynamic variation of gain is below 0.6 dB.  
        关键词：EDFA;DWDM;gain   
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      • MA Wei dong\+1,SHI Wei\+2,FU Hao jun\+2,JIANG Shan\+2,ZHAO Zi sen\+2
        Issue 4, Pages: 34-36(2000) DOI: 10.13756/j.gtxyj.2000.04.008
        摘要：The relations and simulating graphs between the 3 dB bandwidth, peak value, dispersion at λ\-p and sidelobe suppression of the reflection spectrum of linear chirped fiber grating and the chirp value of the grating are given by solving coupled mode equations using the transfer matrix method. In addition, a optimized chirp value range for practical dispersion compensator is obtained by analyzing the simulating graphs.  
        关键词：dispersion;linear chirped fiber grating;coupled mode   
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      • LI Jian xin,HUANG Yong qing,REN Xiao min
        Issue 4, Pages: 37-41(2000) DOI: 10.13756/j.gtxyj.2000.04.009
        摘要：The dispersion relation of the optical field close to the photonic band gap in fiber gratings is obtained through theoretical analysis and numerical simulation. The phase velocity, group velocity and group velocity dispersion （GVD） of the transmission pulse are analyzed. Based on these, the formation conditions of the fundamental grating solitons with the frequency close to the photonic band gap are discussed. We also put forward some scenarios to obtain the grating solitons with lower peak power.  
        关键词：photonic band gap;coupled mode theory;group velocity dispersion;grating soliton   
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      • YANG Jian yi,JIANG Xiao qing,WANG Ming hua
        Issue 4, Pages: 42-48(2000) DOI: 10.13756/j.gtxyj.2000.04.010
        摘要：In this paper, we summarized the recent research progress of optical switches and switch arrays in the terms of the new techniques, new materials, new mechanism and so on.  
        关键词：optical switch;integrated optics;MOEMS;optical fiber communication   
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      • LIU Chong qi
        Issue 4, Pages: 49-51(2000) DOI: 10.13756/j.gtxyj.2000.04.011
        摘要：In this paper, we investigate the reflective spectral response of a optical fiber tilted grating structure with the coupled wave equation. Because the period of fiber tilted grating is larger than that of non tilted grating, the central wavelength of reflectivity is shifted to long wavelength side.  
        关键词：fiber tilted grating;reflection property;coupled wave equation   
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      • LIU Yan ming,GAO Yu xuan,LI Mao xun,CAI Ji shi
        Issue 4, Pages: 52-57(2000) DOI: 10.13756/j.gtxyj.2000.04.012
        摘要：This paper gives a brief introduction on the dense wavelength division multiplexing （DWDM） systems with emphasis on the non linearity of optical fiber at first. And then, the development of the large effective area fiber （LEAF\+\{○R\}） is presented. Besides the profile design, the typical optical properties, the effective area and its measure methods, the application of LEAF\+\{○R\} in telecommunication systems has also been outlined.  
        关键词：non zero dispersion shifted large effective area fiber;non linearity effect;LEAF   
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      • YANG Da wei
        Issue 4, Pages: 58-62(2000) DOI: 10.13756/j.gtxyj.2000.04.013
        摘要：This paper introduces the concept and measure method of splicing loss, the main factors to influence splicing loss and the methods to reduce this loss.  
        关键词：optical fiber;fused splice;loss   
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